A Palestinian boy wears a green headband with the Arabic slogan "'Ezz Al-Din Al Qassam brigade" and green Islamic flags while holding a toy gun during a rally to commemorate the 25th anniversary of the Hamas militant group, in Gaza city, Saturday, Dec. 8, 2012. Thousands of Palestinians are gathering as Hamas chief Khaled Mashaal is expected to speak at Saturday's rally after he entered the seaside strip a day earlier following a long exile from Palestinian territory. (AP Photo/Adel Hana)